Leef Township, Madison County, Illinois

Leef Township is located in Madison County, Illinois, in the United States. As of the 2010 census, its population was 628 and it contained 246 housing units.

History
Leef Township was named for the Swiss immigrant Jacob Leu, who anglicized his name to Leef.

Geography
According to the 2010 census, the township has a total area of 29.38 sqmi, of which 29.26 sqmi (or 99.59%) is land and 0.11 sqmi (or 0.37%) is water.